SGS Silicone O-Ring 1, NBR O-RING made by NBR rubber 2, NBR O-RING restisance oil use in machine or auto 3, NBR O SGS Silicone O-RingO-Ring:1. Several material f or Oil Seal, O-Ring and rubber gasket like: NBR, HNBR, CR, PDFE, EPDM, SILICONE, VITONE, etc. Can choose on your requirement; 2. Many types of oil seal: TC, TB, TA, SC, SB, SA, VC, VB, VA, KC, KB, KA, DC, DB etc, also can make on your ...